Axial length percentile graph
Enter values and click Show on graph
Your OD / OS points will appear on the ethnicity- and sex-specific growth chart here.
Sources & methods
- Clinical framing: Poon N. Axial Length: An Essential for Myopia Management. BC Doctors of Optometry.
- European curves: Tideman JWL, et al. Axial length growth and the risk of developing myopia in European children. Acta Ophthalmol. 2018;96(3):301-309. (P25/P50/P75 anchors; intermediate ages interpolated; outer percentiles estimated.)
- East Asian curves: Sanz Diez P, et al. LMS parameters, percentile, and Z-score growth curves for axial length in Chinese schoolchildren in Wuhan. Sci Rep. 2022;12:4850. Ages 6–15 from published LMS tables; 16–18 lightly extended for display.
- Also related: Diez et al. 2019 growth curves; He et al. 2023 Chinese AL/AL-CR percentiles; IMI clinical management guidelines.
- Crystalline lens power: Hernandez VM, et al. Calculation of crystalline lens power using a modification of the Bennett method. Biomed Opt Express. 2015;6(11):4501–4515 (PMC4646557). Based on Bennett AG (1988); thin-lens position and b coefficient per Eqs. 16–18. Remaining buffer is judged with age-adjusted minima (≤ +18.5 D at 6–9 years, ≤ +17.0 D at 10–13, ≤ +15.5 D at 14–18). Use the Bennett buffer calculator.
Using the wrong ethnicity reference can under- or over-estimate risk. Choose the chart that best matches the child's background and discuss with a clinician. This site is provided for educational use in association with Guildford Eye Clinic.
Not a diagnosis. This calculator plots published population percentile charts for education and discussion with an optometrist or ophthalmologist. It does not replace clinical care or optical biometry interpretation.